Q. No.The property of liquid by which it opposes the flow of itself is called:
1. surface tension
2. bulk modulus
3. viscosity
4. shear modulus
1. surface tension
2. bulk modulus
3. viscosity
4. shear modulus
Subtopic: Viscosity |
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A small rigid spherical ball of mass \(M\) is dropped in a long vertical tube containing glycerine. The velocity of the ball becomes constant after some time. If the density of glycerine is half of the density of the ball, then the viscous force acting on the ball will be: (consider \(g\) as acceleration due to gravity)
1. \(\dfrac {Mg}{2}\)
2. \(\dfrac {3}{2} Mg\)
3. \(2Mg\)
4. \(Mg\)
1. \(\dfrac {Mg}{2}\)
2. \(\dfrac {3}{2} Mg\)
3. \(2Mg\)
4. \(Mg\)
Subtopic: Viscosity |
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The correct dimensional formula of coefficient of viscosity is:
1. \(\left[\mathrm{M}^2 \mathrm{~L}^1 \mathrm{~T}^{-1}\right]\)
2. \(\left[\mathrm{M}^0 \mathrm{~L}^0 \mathrm{~T}^{-1}\right]\)
3. \(\left[\mathrm{M}^1 \mathrm{~L}^2 \mathrm{~T}^{-1}\right]\)
4. \(\left[\mathrm{ML}^{-1} \mathrm{~T}^{-1}\right]\)
1. \(\left[\mathrm{M}^2 \mathrm{~L}^1 \mathrm{~T}^{-1}\right]\)
2. \(\left[\mathrm{M}^0 \mathrm{~L}^0 \mathrm{~T}^{-1}\right]\)
3. \(\left[\mathrm{M}^1 \mathrm{~L}^2 \mathrm{~T}^{-1}\right]\)
4. \(\left[\mathrm{ML}^{-1} \mathrm{~T}^{-1}\right]\)
Subtopic: Viscosity |
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Out of air and liquid, which substance is more viscous?
| 1. | Air |
| 2. | Liquid |
| 3. | Both have the same viscosity |
| 4. | None of these |
Subtopic: Viscosity |
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The velocity of the upper layer of water in a river is \(36~\text{kmh}^{-1}.\) Shearing stress between horizontal layers of water is \(10^{-3}~\text{Nm}^{-2}.\) The depth of the river is:
(coefficient of viscosity of water is \(10^{-2}~\text {Pa-s}\) )
1. \(100~\text m\)
2. \(200~\text m\)
3. \(300~\text m\)
4. \(400~\text m\)
(coefficient of viscosity of water is \(10^{-2}~\text {Pa-s}\) )
1. \(100~\text m\)
2. \(200~\text m\)
3. \(300~\text m\)
4. \(400~\text m\)
Subtopic: Viscosity |
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Choose the correct statement among the following:
| 1. | As temperature increases, the viscosity of a liquid decreases. |
| 2. | As temperature increases, the viscosity of gas increases. |
| 3. | As temperature decreases, the viscosity of gas increases. |
| 4. | Both (1) and (2) |
Subtopic: Viscosity |
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If the terminal speed of a sphere of gold (density = \(19.5~\text{kg/m}^3\)) is \(0.2~\text{m/s}\) in a viscous liquid (density = \(1.5~\text{kg/m}^3\)), the terminal speed of a sphere of silver (density = \(10.5~\text{kg/m}^3\)) of the same size in the same liquid will be:
1. \(0.4~\text{m/s}\)
2. \(0.133~\text{m/s}\)
3. \(0.1~\text{m/s}\)
4. \(0.2~\text{m/s}\)
Subtopic: Viscosity |
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Water on the surface of a river \(10\) m deep is observed to be flowing at \(5\) m/s. The shearing stress between horizontal layers of the river is:
(\(\eta=10^{-3}\) SI units)
1. \(10^{-3}\) N/m2
2. \(0.8 \times 10^{-3}\) N/m2
3. \(0.5 \times 10^{-3}\) N/m2
4. \(1\) N/m2
(\(\eta=10^{-3}\) SI units)
1. \(10^{-3}\) N/m2
2. \(0.8 \times 10^{-3}\) N/m2
3. \(0.5 \times 10^{-3}\) N/m2
4. \(1\) N/m2
Subtopic: Viscosity |
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A spherical solid ball of volume \(V\) is made of a material of density \(\rho_1.\) It is falling through a liquid of density \(\rho_2(\rho_2<\rho_1)\) Assuming that the liquid applies a viscous force on the ball that is proportional to the square of its speed \(v,\) i.e., \(F_{\text{viscous}}=-kv^2(k>0),\) the terminal speed of the ball is:
| 1. | \( \dfrac{{Vg} \rho_1}{k} \) | 2. | \( \sqrt{\dfrac{{Vg} \rho_1}{k}} \) |
| 3. | \( \dfrac{{Vg}\left(\rho_1-\rho_2\right)}{k} \) | 4. | \( \sqrt{\dfrac{{Vg}\left(\rho_1-\rho_2\right)}{k}} \) |
Subtopic: Viscosity |
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A metal block with a base area of \(0.20~\text{m}^2\) rests on a table with a liquid film of thickness \(0.25~\text{mm}\) between them. When a horizontal force of \(0.1~\text{N}\) is applied, the block moves at a constant speed. If the liquid's viscosity is \(5.0\times10^{-3} ~\text{Pa-s},\) what is the speed of the block?
| 1. | \(35\times 10^{-3}~\text{m/s}\) | 2. | \(25\times 10^{-3}~\text{m/s}\) |
| 3. | \(45\times 10^{-3}~\text{m/s}\) | 4. | \(15\times 10^{-3}~\text{m/s}\) |
Subtopic: Viscosity |
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